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I'm sorry you've been waiting so long，but it'll still be some time ________ Brian gets back.(2008·北京)
A．beforeB．sinceC．tillD．after
A
考查狀語從句。本題使用了“it be＋一段時間＋before引導的從句”句型，表示“在……之前還需要一段時間，一段時間之后發(fā)生某事”。后面句子的含義：不過Brian還要過一會兒才能回來。
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